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  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
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  <script>
    let ary = [1, 2, 3];
    //...ary相当于1, 2, 3
    console.log(...ary);	// 1 2 3
    // 等价于
    console.log(1, 2, 3);	// 1 2 3
  </script>
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